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This crossover makes it to where the events of Rapunzel's 18th birthday and the events of Elsa's coronation possible within the same world, even making it to where they are related in some way.

This crossover may, in fact, be canon within the respective films. Rapunzel and Eugene make a cameo during the song sequence "For the First Time in Forever", entering Castle Arendelle as the gates open and Anna leaves to explore. The crew that made both films have confirmed that Rapunzel is Elsa and Anna's cousin.